2020MSMcivicSI
Senior Member
- First Name
- Derek
- Joined
- Feb 11, 2020
- Threads
- 6
- Messages
- 173
- Reaction score
- 158
- Location
- Columbus, OH
- Vehicle(s)
- 2020 Civic SI Sedan
- Thread starter
- #1
IMO, the biggest exhaust problem with the 10th gen SI is that when you put a downpipe on it (especially catless), the volume is very hard to control, and it really doesn't matter what exhaust you have. Both stock and any aftermarket cat back... they all get too loud, raspy for a DD. (This is all based on sound clips... have not heard any exhaust in person)
So here is my SI full turbo back exhaust idea that should perform and be quiet:
1) 27won catless downpipe (3" -> 2.5")
2) 27won frontpipe (2.5" -> 2.5")
3) Vibrant Ultra Quiet Resonator #1141 (2.5" -> 2.5")
4) Borla S-Type muffler #40842S (2.5" -> 2.5")
5) Vibrant Streetpower muffler #1110 (2.5" -> Dual 2.25")
6a) Stock SI tip (for completely "sleeper" looking exhaust)
6b) Borla Resonated Exhaust Tips #20248 (2.25" -> 4")
All of above is ~$1000. Only cost left is an exhaust shop to make the 2.5" tubing and hangers to connect it all... I'm hoping that won't be too much (I do not have the skill or tools to weld so DIY is out).
I've done some measurements and I believe all this can fit in relatively "stock" locations. 1&2 above are exactly stock replacements. #3 will go right after the front pipe where there are already heat shields but only straight pipe (the type-r has a resonator here stock). #4 will go where the current SI resonator is (the stock resonator is almost the exact same size as the Borla muffler). #5 goes right where the stock SI system starts an upturn and then splits. #6a will definitely be easier to install but #6b should cut down on some more sound. If I did 6b, it will look a lot like the Greddy DDR exhaust (the exhaust tips are 12" long and 4" diameter).
The stock noise suppression is 1 huge cat, 1 resonator, and 2 mufflers in parallel. This would be 0 cats, 1 resonator, and 2 mufflers in series. (Don't know really if the resonated tips will do much).
There are 2 main reasons I don't just go ahead with this:
1) Maybe still too loud
2) I don't know a shop that I trust to weld this all together
Minor reason - don't want to hack up the stock exhaust just for the HDMI tip
So, does anyone have recommendations for a central OH exhaust shop? (Or at least one within reasonable driving distance)
Do you think this would actually get down to stockish DB levels? (Too quiet is a good problem to have IMO)
Is there anyone out there that has tried vibrant muffler with catless downpipe? (Couldn't find any audio clips) Or any combination of catless downpipe/muffler with no drone or rasp?
Should I keep the stock tip for a true "sleeper" look?
Sorry for the long post and feel free to build the above system and post sound clips here =)
So here is my SI full turbo back exhaust idea that should perform and be quiet:
1) 27won catless downpipe (3" -> 2.5")
2) 27won frontpipe (2.5" -> 2.5")
3) Vibrant Ultra Quiet Resonator #1141 (2.5" -> 2.5")
4) Borla S-Type muffler #40842S (2.5" -> 2.5")
5) Vibrant Streetpower muffler #1110 (2.5" -> Dual 2.25")
6a) Stock SI tip (for completely "sleeper" looking exhaust)
6b) Borla Resonated Exhaust Tips #20248 (2.25" -> 4")
All of above is ~$1000. Only cost left is an exhaust shop to make the 2.5" tubing and hangers to connect it all... I'm hoping that won't be too much (I do not have the skill or tools to weld so DIY is out).
I've done some measurements and I believe all this can fit in relatively "stock" locations. 1&2 above are exactly stock replacements. #3 will go right after the front pipe where there are already heat shields but only straight pipe (the type-r has a resonator here stock). #4 will go where the current SI resonator is (the stock resonator is almost the exact same size as the Borla muffler). #5 goes right where the stock SI system starts an upturn and then splits. #6a will definitely be easier to install but #6b should cut down on some more sound. If I did 6b, it will look a lot like the Greddy DDR exhaust (the exhaust tips are 12" long and 4" diameter).
The stock noise suppression is 1 huge cat, 1 resonator, and 2 mufflers in parallel. This would be 0 cats, 1 resonator, and 2 mufflers in series. (Don't know really if the resonated tips will do much).
There are 2 main reasons I don't just go ahead with this:
1) Maybe still too loud
2) I don't know a shop that I trust to weld this all together
Minor reason - don't want to hack up the stock exhaust just for the HDMI tip
So, does anyone have recommendations for a central OH exhaust shop? (Or at least one within reasonable driving distance)
Do you think this would actually get down to stockish DB levels? (Too quiet is a good problem to have IMO)
Is there anyone out there that has tried vibrant muffler with catless downpipe? (Couldn't find any audio clips) Or any combination of catless downpipe/muffler with no drone or rasp?
Should I keep the stock tip for a true "sleeper" look?
Sorry for the long post and feel free to build the above system and post sound clips here =)
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